| darmstadtium | (n) a radioactive transuranic element, Syn. atomic number 110, element 110, Ds |
| roentgenium | (n) a radioactive transuranic element, Syn. atomic number 111, element 111, Rg |
| sodium | (n) a silvery soft waxy metallic element of the alkali metal group; occurs abundantly in natural compounds (especially in salt water); burns with a yellow flame and reacts violently in water; occurs in sea water and in the mineral halite (rock salt), Syn. Na, atomic number 11 |
| ununbium | (n) a radioactive transuranic element, Syn. Uub, atomic number 112, element 112 |
| ununhexium | (n) a radioactive transuranic element, Syn. atomic number 116, element 116, Uuh |
| ununpentium | (n) a radioactive transuranic element, Syn. atomic number 115, element 115, Uup |
| ununquadium | (n) a radioactive transuranic element, Syn. Uuq, atomic number 114, element 114 |
| ununtrium | (n) a radioactive transuranic element, Syn. element 113, Uut, atomic number 113 |
